Vampire Knight (ヴァンパイア騎士, Vanpaia Naito) is a shōjomanga and anime series written by Matsuri Hino. The series premiered in the January 2005 issue of LaLa magazine and is still on-going. Chapters are collected and published in tankōbon by Hakusensha, with eleven volumes currently released in Japan. The manga series is licensed in English by Viz Media, who has released ten volumes so far. The English adaptation premiered in the July 2006 issue of Viz's Shojo Beat magazine, with the collected volumes being published on a quarterly basis.

Two drama CDs were created for the series, as well as a twenty-six episode anime adaptation. Produced by Studio Deen, the anime series first season aired in Japan on TV Tokyo between April 8, 2008 and July 1, 2008. The second season, titled Vampire Knight Guilty aired on the same station from October 7, 2008 and December 30, 2008. The anime uses many of the same voice actors as were used for the drama CDs. The anime adaptations have been licensed for release in North America by Viz Media, the DVD will be released on July 20, 2010.

Yuki's earliest memory is of a stormy night in winter, where she was attacked by a rogue vampire and rescued by Kaname Kuran, a Pureblood vampire. Now ten years later, Yuki Cross, the adopted daughter of the headmaster of Cross Academy, Kaien Cross, has grown up and become a guardian of the vampire race, protecting her childhood crush, Kaname, from discovery as he leads a group of vampires at the elite boarding school. At her side is Zero Kiryu, a childhood friend whose hatred for the creatures that destroyed everything he held dear leaves him determined never to trust them. This coexisting arrangement seems all well and good, but have the vampires truly renounced their murderous ways, or is there a darker truth behind their actions? In this world of secrets, nothing is as it seems. The price of misplaced trust may even be worse than death. Should Yuki truly find out what was in her past, is the truth going to hurt her worse than not knowing?